Ceiling leak and water-stain trace across London

A brown ring on a bedroom ceiling, a soft sagging patch above the kitchen island, or a slow bulge in the lounge artex; ceiling stains are one of the most common reasons London leaseholders call us. The visible mark is rarely where the leak originates. Water tracks along joists, runs down service voids, and pools at the lowest plasterboard joint, which means the stain often sits 1 to 3 metres from the actual pinhole or failed seal feeding it. Find the wrong spot, and the cutting, drying, and redecoration costs balloon for no reason.

Our team uses a non-destructive workflow built around FLIR E76 and E96 thermal cameras, Protimeter Surveymaster dual-mode moisture meters, and acoustic loggers to triangulate the source from the cleanest possible side. Where the ceiling sits below a flat in a London leasehold block, we coordinate access with the upstairs occupier or managing agent, and we issue an insurance-grade written report with thermal images and moisture maps, so the trace-and-access cover on your policy pays for the diagnostic.

How we deliver

No surprises, no upselling. The exact path every job follows.

1. 1
   Symptom interview and occupancy check
   We log when the stain first appeared, what's directly above, and whether the upstairs flat or roof void has had recent works. For leasehold properties we confirm the access route with the managing agent before we leave the office.
2. 2
   Moisture mapping with Protimeter Surveymaster
   We grid the affected ceiling in capacitance mode to a 200mm spacing, then pin-probe the worst readings to separate surface damp from a saturated substrate.
3. 3
   Thermal imaging sweep
   A FLIR E76 or E96 sweep of the ceiling and the walls above reveals cooler evaporative plumes and warmer hot-feed leaks, typically pinpointing the source to within 100mm before we cut anything.
4. 4
   Upstairs verification
   With the upstairs occupier's consent, we test each suspect fitting in turn: shower trap, bath waste, basin pop-up, WC pan connector, and washing-machine standpipe, watching the thermal signature change in real time.
5. 5
   Tracer-gas confirmation where needed
   For pressurised pipework hidden in screed or behind tiles, we isolate the suspect circuit and introduce a 5% hydrogen, 95% nitrogen blend, then sniff the ceiling face to confirm the precise leak point.
6. 6
   Controlled access cut
   Only after the source is confirmed do we make a tidy, minimum-size cut, usually a 300mm by 300mm square between joists, large enough for the repair, small enough for clean reinstatement.
7. 7
   Insurance-grade written report
   Photos, moisture readings, thermal frames, and a marked-up floor plan, in the format required by Aviva, Direct Line, AXA, LV, and the major loss adjusters.